CN116295243B - System and method for monitoring stratum bulge settlement deformation of water area in underwater tunnel construction - Google Patents
System and method for monitoring stratum bulge settlement deformation of water area in underwater tunnel construction Download PDFInfo
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- CN116295243B CN116295243B CN202310102095.7A CN202310102095A CN116295243B CN 116295243 B CN116295243 B CN 116295243B CN 202310102095 A CN202310102095 A CN 202310102095A CN 116295243 B CN116295243 B CN 116295243B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 318
- 238000012544 monitoring process Methods 0.000 title claims abstract description 62
- 238000010276 construction Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004062 sedimentation Methods 0.000 claims abstract description 31
- 238000006073 displacement reaction Methods 0.000 claims abstract description 15
- 238000005086 pumping Methods 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 12
- 230000005641 tunneling Effects 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 238000009412 basement excavation Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 239000003643 water by type Substances 0.000 claims description 2
- 238000005452 bending Methods 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 10
- 238000012545 processing Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
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- 230000000630 rising effect Effects 0.000 description 3
- 238000012876 topography Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
- G01C5/04—Hydrostatic levelling, i.e. by flexibly interconnected liquid containers at separated points
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
The invention provides a system and a method for monitoring the uplift settlement deformation of a water area stratum in underwater tunnel construction, comprising the following steps: the device comprises a water bag, a water pressure gauge/water level gauge, a data acquisition transmitter and an upper computer; the water bag is internally provided with a water pressure gauge/water level gauge and a data acquisition transmitter, and the water pressure gauge/water level gauge acquires water pressure data when the water bag is closely attached to the water bottom surface and transmits the water pressure data to the upper computer through the data acquisition transmitter; the upper computer processes the received water pressure data to obtain differential sedimentation value, sedimentation rate and sedimentation trend curves, and meanwhile, according to absolute elevation information of the initial points, the relative sedimentation elevation deformation displacement of each measuring point based on the initial points is calculated to obtain absolute deformation displacement values.
Description
Technical Field
The invention belongs to the technical field of geotechnical engineering, and particularly relates to a system and a method for monitoring water area stratum bulge settlement deformation in underwater tunnel construction.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The shield construction is one of the main construction methods for constructing underwater tunnels penetrating through rivers and straits, and is applied to urban road tunnels, and the shield method tunnel engineering technology is developed to large-depth, large-section and long-distance directions in recent decades to build a batch of ultra-large-diameter submarine (river) tunnels and urban road tunnels.
The large-diameter shield tunnel is commonly used for highway and railway tunnel construction due to high construction efficiency and structural safety and durability. With the improvement of shield tunneling speed and various complex stratum crossing technologies, the requirement for monitoring the subsidence and the rising of the tunnel earth surface is increasing. For large-diameter shield tunnels penetrating through water areas such as sea, river, reservoir and the like, the difficulty in monitoring the surface subsidence of the water area is high, the underwater pavement is designed, the subsidence monitoring method for actually providing subsidence information for engineering is a difficult problem to be solved in scientific research institutions and project units.
Because of the specificity of the water area, the existing monitoring method for the surface subsidence and uplift of the water area is mainly instrument monitoring. The instrument monitoring is mostly a radar monitoring system, but is greatly influenced by a water area, so that the implementation difficulty is high and the equipment cost is high.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a water area stratum bulge settlement deformation monitoring system in underwater tunnel construction, which is applicable to both a construction period and an operation period, is simple to operate and meets the precision requirement.
To achieve the above object, one or more embodiments of the present invention provide the following technical solutions:
in a first aspect, a system for monitoring the uplift settlement deformation of a water area stratum in underwater tunnel construction is disclosed, comprising:
the device comprises a water bag, a water pressure gauge/water level gauge, a data acquisition transmitter and an upper computer;
the water bag is internally provided with a water pressure meter/water level meter acquisition transmitter, and the water pressure meter/water level meter acquires water pressure data when the water bag is closely attached to the water bottom surface and transmits the water pressure data to the upper computer through the data acquisition transmitter;
the upper computer processes the received water pressure data to obtain differential sedimentation value, sedimentation rate and sedimentation trend curves, and meanwhile, according to absolute elevation information of the initial points, the relative sedimentation elevation deformation displacement of each measuring point based on the initial points is calculated to obtain absolute deformation displacement values.
As a further technical scheme, a communication module connected with the data acquisition transmitter is arranged in the water pressure gauge/water level gauge, and the communication module transmits the processed and converted data to the data acquisition transmitter.
As a further technical scheme, paving a water bag in a construction influence area along the advancing direction of the shield tunnel for monitoring the subsidence and the uplift of the underwater ground surface;
the monitoring line in the water bag is perpendicular to or parallel to the shield direction, and the length and the width of the water bag are designed according to the diameter of the shield and the number of daily tunneling rings: the width of the water bag is 1.2-1.5 times of the diameter of the tunnel, and the length of the water bag is 1.1-1.2 times of the daily tunneling length.
As a further technical scheme, the hose is closely adhered to the bottom of the water sac, waterproof strain gauges are adhered to the upper and lower sides of the hose, the waterproof strain gauges are used for collecting strain of the upper wall and the lower wall of the hose, the deformation of the bottom of the hose is estimated based on the strain, and the deformation displacement obtained by calculation through data collected by the water pressure gauge/the water level gauge is combined to establish the surface subsidence and elevation deformation.
As a further technical scheme, the water sac layout position moves along with the shield tunneling.
As a further technical scheme, a plurality of detection lines are arranged in the water bag according to rows and columns, a height difference with a set distance is arranged between each two detection lines, a plurality of water pressure meters/water level meters are arranged on the detection lines, and settlement and uplift of the stratum in the water area are calculated through the water pressure difference of each point.
As a further technical scheme, water filling and pumping ports and air discharging and charging ports are respectively arranged at two ends of the water bag, the water filling and pumping ports are connected with a water pump and a water tank, the air discharging and charging ports are connected with an air pump, and the ports are provided with valves and can be closed after air discharging, water filling and air charging.
As a further technical scheme, the water injection and drainage system comprises a water tank and a pressure water pump, wherein the water bag port is connected with the water tank and the pressure water pump through a pipeline, when water is pressurized and input into the pipeline, the water bag sinks to the surface of the ground surface of a water area, and the liquid in the pipeline is always in a water full state, so that the normal display of each measuring point water pressure gauge/water level gauge is recorded; when air is pressurized and input into the pipeline, the water bag floats upwards to adjust the monitoring area or floats upwards to the water surface.
In a second aspect, a method for monitoring the uplift settlement deformation of a stratum in a water area in underwater tunnel construction is disclosed, which comprises the following steps:
determining the position of a monitoring section, paving a water bag in a section area along the advancing direction of the shield tunnel, wherein a monitoring line in the water bag is vertical or parallel to the shield direction;
pumping air and injecting water into the water bag to enable the water bag to slowly sink to the detection surface;
measuring and recording initial pressure and water level before monitoring, comparing whether the pressure is consistent with the water level elevation or not to check the monitoring equipment to be normal and calculate the initial water depth and the underwater ground surface elevation;
and (3) measuring the water pressure and the water level of the ground before, during and after tunnel excavation through real-time monitoring, comparing with the initial water depth, and calculating the change of the settlement raised surface.
As a further technical scheme, the water bag moving device further comprises the following steps: and (3) pumping out the water in the water bag, pressing in the gas, enabling the water bag to float out of the water surface, moving to a set position, and pumping air and injecting water into the water bag to enable the water bag to slowly sink to the detection surface.
The one or more of the above technical solutions have the following beneficial effects:
according to the technical scheme, water filling and air exhausting are performed under the control of the water filling and draining system, water draining and air filling are performed, and accordingly sinking and floating of the water bag in water are achieved. The water bag is made of materials which are easy to deform but not expand in volume, so that the water bag can be ensured to deform along with the subsidence of the earth surface of a water area, and the internal water pressure is prevented from being reduced due to the overlarge volume change.
The technical scheme of the invention is particularly suitable for real-time monitoring of the surface fluctuation deformation of the water area caused by construction in the construction period of the shield tunnel crossing the water area, and is also an effective method for measuring the topography of the underwater ground surface. The technical scheme of the invention is a water area surface subsidence and uplift monitoring system which can meet engineering requirements, is applicable to both construction period and operation period, is simple to operate, meets precision requirements and is reasonable in cost.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic diagram showing the use state of a water bag according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an embodiment of the present invention of an in-bladder sensor arrangement.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention.
Embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Example 1
The embodiment discloses a waters district stratum uplift subsides deformation monitoring system in tunnel construction under water, includes:
the device comprises a water bag, a water pressure gauge/water level gauge, a data acquisition transmitter and an upper computer;
the water bag is internally provided with a water pressure gauge/water level gauge and a data acquisition transmitter, wherein the water pressure gauge/water level gauge acquires water pressure data when the water bag is closely attached to the water bottom surface and transmits the water pressure data to the upper computer through the data acquisition transmitter;
the upper computer processes the received water pressure data to obtain differential sedimentation value, sedimentation rate and sedimentation trend curves, and meanwhile, according to absolute elevation information of the initial points, the relative sedimentation and elevation deformation displacement of each measuring point based on the initial points is calculated to obtain absolute deformation displacement values.
The water pressure meter/water level gauge adopts a water pressure data sensor, the upper computer is provided with software for collecting water pressure data signals and converting water area displacement, and the water pressure data collected by the wireless water pressure monitoring sensor and the pressure signals received by the wireless data collecting and transmitting device are converted into relevant data of the water area fluctuation displacement. The water pressure gauge/water gauge refers to a water pressure gauge or water gauge.
A communication module connected with the water pressure wireless data acquisition transmitter is arranged in the water pressure data sensor, and the communication module transmits the processed and converted data to the data acquisition transmitter;
and processing the received water pressure data to obtain differential sedimentation value, sedimentation rate and sedimentation trend curves, and simultaneously calculating to obtain the relative sedimentation and elevation deformation displacement of each measuring point based on the initial point according to absolute elevation information of the initial point to obtain an absolute deformation displacement value.
Differential sedimentation value = sedimentation bulge deformation value
Sedimentation rate = sedimentation deflection/sedimentation deflection time (data acquisition time interval)
The sedimentation trend curve includes two types:
1. tendency to subside at one point. And (3) establishing a plane rectangular coordinate system, taking time as an x-axis, taking a data acquisition time interval as a unit coordinate, taking the settlement amount as a y-axis, and displaying the settlement amount visualization of time change at one point.
2. Sedimentation trend over time in the entire zone. And (3) establishing a planar topography map, wherein the planar topography map is upward in the north direction, the planar position of each key measuring point is marked in the map, and the sedimentation and rising deformation of each point in a period of time (24 h is taken as an example) is a histogram.
The initial point is absolute to the elevation information of the coordinates, and the national elevation reference points are utilized for elevation guiding and measuring, and the engineering construction is measured and paid off.
The elevation difference between each measuring point and the initial point. And (3) setting the absolute elevation of the initial point as H, setting the initial water pressure as P, collecting the water pressure data deltap of the measuring point and the water pressure difference of the initial point, obtaining the elevation difference deltaZ of the measuring point relative to the initial point according to the Bernoulli formula deltaZ=deltaP/gamma, and then calculating to obtain the absolute elevation Z=H+deltaZ of the measuring point.
The strain data of the bottom of the water bag close to the water bottom is collected, the settlement amount is determined according to the deformation of the upper wall and the lower wall of the hose in the water bag and the diameter of the hose, the change of the settlement amount is analyzed to estimate the bulge and settlement deformation change of the bottom, the ground change obtained according to the water pressure is compared and verified, and the compared amount is the settlement amount obtained by the strain gauge and the settlement amount obtained by the water pressure meter/water level gauge. The method realizes timely, all-weather and uninterrupted high-precision monitoring and early warning of the subsidence and the rising of the earth surface of the shield tunnel in the construction period.
The water bag can be filled with water and exhausted under the control of the water filling and draining system, and is used for draining and inflating so as to realize the sinking and floating of the monitoring system in water.
In the embodiment, the water bag is made of common deformable materials, and the flexibility can adapt to follow the ground deformation condition, so that the effect of synchronously following the ground deformation is achieved, and further the ground subsidence and uplift monitoring is realized. The water bag is made of materials which are easy to deform but do not expand in volume, so that the water bag can be ensured to deform along with the subsidence of the ground surface of a water area.
In the embodiment, the water pressure data sensor is a wireless pressure and water level sensor and is used for collecting water pressure at each measuring point, converting the water pressure into an electric signal and sending the electric signal to a wireless data collecting and transmitting device corresponding to the pressure sensor.
Adopting a high-precision water pressure gauge/water level gauge to refer to initial water pressure at a position so as to ensure the precision required by engineering; a plurality of high-precision water pressure meters/water level meters are arranged in the water bag, and sedimentation bulge is calculated through water pressure differences of each point; ensuring that a plurality of detection lines are arranged in the water bag according to rows and columns, wherein the height difference of each detection line is smaller than 200mm so as to avoid overlarge height difference of the same detection, overhigh measuring range of a water pressure gauge/a water level gauge and larger measuring error; the monitoring lines in the water bag are flexibly arranged according to engineering requirements. 3 tunnel shields are arranged in the advancing direction, 5 tunnels are arranged in the vertical direction, and the ground subsidence and uplift surface changes before, during and after tunnel excavation are measured through real-time monitoring, so that the size is freely expanded, and the cost is reduced.
In this embodiment, the device further comprises a strain monitoring unit, wherein the strain monitoring unit comprises a hose, the hose is closely attached to the bottom of the water bag, a strain gauge is attached between the hose and the water bag, the deformation and the change of the bottom are estimated through the strain of the upper wall and the lower wall of the hose, the water pressure deformation is combined, the settlement is determined according to the deformation of the upper wall and the lower wall and the thickness of the pipe, and then the surface subsidence bulge deformation is established.
The monitoring module composed of the high-precision pressure sensor, the strain gauge and the data acquisition transmitter is fixed at a fixed position in the water sac, and the water sac layout position moves along with the shield tunneling.
In this embodiment example, the water filling and draining system is further included, and specifically includes a water tank and a pressure water pump. Connecting a water bag port with a water tank and a pressure water pump, connecting a pipeline with the water bag, the water tank and the pressure water pump, and when water is pressurized and input into the pipeline, sinking the water bag to the surface of the ground surface of a water area, and ensuring that liquid in the pipeline is always in a water full state so as to record that the water pressure gauge/the water level gauge of each measuring point is normally displayed; when air is pressurized and input into the pipeline, the water bag floats upwards to adjust the monitoring area or floats upwards to the water surface for inspection and movement.
The receiver of the wireless micro-pressure sensor is matched with the wireless pressure sensor for use, and comprises data acquisition, transmission, analysis and processing and visual presentation. And finally, obtaining displacement data of the surface subsidence bump from the original pressure water head data.
The receiver is arranged outside the water bag and connected to the upper computer, and data of the water pressure gauge/water level gauge in the water bag are transmitted to the upper computer for processing.
It should be noted that, the monitoring system needs to perform test operation before formal operation, so as to exhaust gas, ensure that the liquid in the water bag is full, and ensure tightness of the water bag, whether the water pressure sensor senses normally and sends data, and whether the data acquisition transmitter receives normally. When the abnormality is determined, correcting the position initial water pressure settlement data, and obtaining the processed settlement data for subsequent processing.
Example two
The embodiment aims to provide a method for monitoring the uplift settlement deformation of a water area stratum in underwater tunnel construction, which comprises the following steps:
and determining the monitoring section position. According to the actual requirements of engineering construction, water bags are paved in the section area along the advancing direction of the shield tunnel to monitor the subsidence and the uplift of the earth surface. The monitoring line in the water bag is vertical or parallel to the shield direction as much as possible. In order to avoid movement in construction, the length and the width of the water bag are designed according to the diameter of the shield and the daily tunneling ring number: the width of the tunnel can be generally 1.2-1.5 times of the diameter of the tunnel, and the length of the tunnel is 1.1 times of the tunneling length per day.
And placing a water bag above the monitoring area, and pumping air and injecting water into the water bag through an injection and drainage system to enable the water bag to slowly sink to the detection surface, wherein the monitoring area is a section area of the shield tunnel in the advancing direction.
Referring to fig. 2, the monitoring lines in the water bag are flexibly arranged according to engineering requirements. 3 tunnel shields are arranged in the advancing direction, 5 tunnels are arranged in the vertical direction, and the ground subsidence and uplift surface changes before, during and after tunnel excavation are measured through real-time monitoring.
Referring to figure 1, two ends of the water bag are respectively provided with a water filling and pumping port and an air exhausting and charging port. The water filling and pumping port is connected with a water pump and a water tank, the air exhausting and charging port is connected with an air pump, and the port is provided with a valve which can be closed after air exhausting, water draining, water filling and charging. The water pump and the water bag are connected by a water pipe, and the water filling and pumping port comprises a water filling port and a water pumping port, wherein the water filling port and the water pumping port are two openings on the water bag.
And before monitoring, measuring and recording the initial pressure, and comparing whether the pressure is consistent with the water level elevation so as to check that the monitoring equipment is normal, so that engineering monitoring can be performed. If not, possible reasons are:
1) The tightness of the connection of the hose and the water bag is not perfect.
2) The wireless water pressure/level gauge fails.
The data are processed and transmitted to an operation room of the shield machine by utilizing a wireless transmission system, the incision pressure is adjusted according to stratum deformation, safe construction is realized, and the transmitted data are specifically ground subsidence data of a water area.
When the monitoring position needs to be replaced, the water bag is moved, and the concrete mode is as follows: pumping out water in the water bag, pressing in gas, enabling the water bag to float out of the water surface, moving to a set position, and pumping air and injecting water into the water bag through the water injection and drainage system to enable the water bag to sink to the water bottom.
The surface deformation calculation method comprises the following steps:
1) The difference between the initial pressure and the pressure at a certain time is used to obtain the variation of P, namely delta P, and the delta Z is converted by delta P. The height of the starting point position is set to be 0, the water pressure is P, the water pressure meter/water level meter reading P+delta P of the point to be measured is set according to the Bernoulli principle of fluid mechanics:
wherein:
p-the pressure at a point in the fluid
v-flow velocity at a point in a fluid
ρ -fluid Density
g-gravity acceleration
h-the height at which the point is located
C-constant (1 type and 2 type constant C are different)
γ—liquid gravity, γ=ρg
Bernoulli's law must satisfy the following assumptions to get an accurate solution, if not an approximate solution.
(1) And (5) steady flow is ensured. The nature of any point in the fluid in the flow system is not changed.
(2) Incompressible fluid. The fluid density is constant.
(3) No frictional flow. The coefficient of viscosity is 0, ignoring the friction effect.
(4) The fluid flows along the streamline. The fluid units flow along streamlines, which do not intersect each other.
2) In the present system, fluid flow rate is not considered. I.e. according to
v＝0
The method comprises the following steps:
so a sedimentation bulge is obtained:
3) Each point deltaz is plotted. The connecting points form a sedimentation hump, which is compensated for by a quadratic linear difference for the intermediate points when needed.
4) Constructing ground deformation of the settlement hump;
5) Adopts water: 1mm = 10Pa, to ensure a 0.1mm accuracy, a water pressure gauge/water level gauge error <1Pa is required.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (4)
1. Stratum bulge settlement deformation monitoring system in waters district in tunnel construction under water, characterized by includes:
the device comprises a water bag, a water pressure gauge/water level gauge, a data acquisition transmitter and an upper computer;
the water bag is internally provided with a water pressure gauge/water level gauge and a data acquisition transmitter, and the water pressure gauge/water level gauge acquires water pressure data when the water bag is closely attached to the water bottom surface and transmits the water pressure data to the upper computer through the data acquisition transmitter;
the upper computer processes the received water pressure data to obtain differential sedimentation value, sedimentation rate and sedimentation trend curves, and meanwhile, according to absolute elevation information of an initial point, the relative sedimentation elevation deformation displacement of each measuring point based on the initial point is calculated to obtain an absolute deformation displacement value;
paving water bags in a construction influence area along the advancing direction of a shield tunnel, wherein the arrangement position of the water bags moves along with the shield tunneling and is used for monitoring the subsidence and the uplift of the underwater ground surface;
a plurality of monitoring lines are arranged in the water bag according to rows and columns, a height difference with a set distance is arranged between each monitoring line, a plurality of water pressure meters/water level meters are arranged on the detection lines, and settlement and uplift of the stratum in the water area are calculated through the water pressure difference of each point; the monitoring line in the water bag is perpendicular to or parallel to the shield direction, and the length and the width of the water bag are designed according to the diameter of the shield and the number of daily tunneling rings;
the hose is closely adhered to the bottom of the water bag, waterproof strain gauges are adhered to the upper and lower sides of the hose, the waterproof strain gauges are used for collecting strain of the upper wall and the lower wall of the hose, the deformation of the bottom of the hose is estimated based on the strain, and the surface subsidence elevation deformation is established by combining the deformation displacement obtained through calculation by utilizing data collected by the water pressure gauge/the water level gauge;
the method comprises the steps of determining settlement according to deformation of upper and lower walls of a hose in a water bag and the diameter of the hose, analyzing the change of the settlement according to the difference of the bending arc length, and presuming the bulge and settlement deformation change of the bottom surface, comparing the settlement with the ground change obtained according to water pressure, wherein the compared quantity is the settlement obtained by a strain gauge and the settlement obtained by a water pressure meter/water level gauge during comparison;
the two ends of the water bag are respectively provided with a water filling and pumping port and an air exhausting and charging port, the water filling and pumping port is connected with a pressure water pump and a water tank, the air exhausting and charging port is connected with an air pump, and the ports are provided with valves and can be closed after air exhausting, water draining, water filling and air charging;
the water injection and drainage system comprises a water tank and a pressure water pump, wherein the port of the water bag is connected with the water tank and the pressure water pump through pipelines, when water is pressurized and input into the pipelines, the water bag sinks to the surface of the ground surface of the water area, and the liquid in the pipelines is always in a water full state, so that the normal display of the water pressure gauge/the water level gauge of each measuring point is recorded; when air is pressurized and input into the pipeline, the water bag floats upwards to adjust the monitoring area or floats upwards to the water surface.
2. The system for monitoring the uplift settlement deformation of a water area stratum in the underwater tunnel construction according to claim 1, wherein a communication module connected with the data acquisition transmitter is arranged in the water pressure gauge/water level gauge, and the communication module transmits the processed and converted data to the data acquisition transmitter.
3. A method for monitoring the uplift settlement deformation of a water area stratum in underwater tunnel construction, which is used for realizing the method as claimed in any one of claims 1-2, and is characterized by comprising the following steps:
determining the position of a monitoring section, paving a water bag in a section area along the advancing direction of the shield tunnel, wherein a monitoring line in the water bag is vertical or parallel to the shield direction;
pumping air and injecting water into the water bag to enable the water bag to slowly sink to the detection surface;
measuring and recording initial pressure and water level before monitoring, and comparing whether the pressure is consistent with the water level elevation; if the water depth is consistent with the ground surface elevation of the underwater ground, the monitoring equipment is proved to be normal, engineering monitoring can be carried out, and the initial water depth and the ground surface elevation of the underwater ground are calculated;
and (3) measuring the water pressure and the water level of the ground before, during and after tunnel excavation through real-time monitoring, comparing with the initial water depth, and calculating the change of the settlement raised surface.
4. The method for monitoring the uplift settlement deformation of a water area stratum in the underwater tunnel construction according to claim 3, further comprising the steps of: and (3) pumping out the water in the water bag, pressing in the gas, enabling the water bag to float out of the water surface, moving to a set position, and pumping air and injecting water into the water bag to enable the water bag to slowly sink to the detection surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310102095.7A CN116295243B (en) | 2023-02-09 | 2023-02-09 | System and method for monitoring stratum bulge settlement deformation of water area in underwater tunnel construction |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110374605A (en) * | 2019-07-01 | 2019-10-25 | 天津大学 | The outer lateral earth pressure measuring device of water-bag type shield tunnel and method |
| CN115096223A (en) * | 2022-03-07 | 2022-09-23 | 北京城建勘测设计研究院有限责任公司 | Method for monitoring riverbed sedimentation during construction of tunnel underpass riverway |
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| CN113296134B (en) * | 2021-04-15 | 2023-08-29 | 中国地质大学（武汉） | Reservoir landslide array type underwater deformation monitoring device and monitoring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110374605A (en) * | 2019-07-01 | 2019-10-25 | 天津大学 | The outer lateral earth pressure measuring device of water-bag type shield tunnel and method |
| CN115096223A (en) * | 2022-03-07 | 2022-09-23 | 北京城建勘测设计研究院有限责任公司 | Method for monitoring riverbed sedimentation during construction of tunnel underpass riverway |
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